This is just a terrible idea. To control just one town, your faction needs to fight every single day for 3 hours. One week it will be at 2PM. The next week it will be 2AM. No faction is going to be able to hold every city. There isn't going to be any huge battles because every minute of the day there is a sigil in play. Only one sigil, meaning no "all or nothing" scenarios where you have a make or break fight to see who wins.